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A Thermomechanically Consistent Constitutive Model for Polyoxymethylene

Experiments, Material Modelling and Computation

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Abstract

In this article tension, compression and torsion tests are presented using thin-walled tubes of polyoxymethylene (POM). These isothermal experiments show non-linear rate dependence, a tension–compression asymmetry and a pronounced relaxation behaviour. On the basis of the experiments carried out, a constitutive model of viscoplasticity with an equilibrium hysteresis in the small-strain regime is developed. Test calculations using finite elements based on the DAE approach show the capabilities of the thermomechanically consistent model. In particular, a very efficient stress algorithm can be derived which has no iteration on the element level. Moreover, it will be shown that time-adaptive finite elements could be of high importance if rate-dependent constitutive models are applied.

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  1. Institute of Mechanics, University of Kassel, Mönchebergstrasse 7, 34109, Kassel, Germany

    Stefan Hartmann

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  1. Stefan Hartmann
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Correspondence to Stefan Hartmann.

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Hartmann, S. A Thermomechanically Consistent Constitutive Model for Polyoxymethylene. Arch Appl Mech 76, 349–366 (2006). https://doi.org/10.1007/s00419-006-0034-8

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  • DOI: https://doi.org/10.1007/s00419-006-0034-8

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